One of Us, One of Them - S3-E3
Revealing mistake: When Tracey looks at Nikki's dead body in the coffin (both played by Ali Larter) we can see Nikki's eyelids flicker.
One of Us, One of Them - S3-E3
Factual error: When Hiro and Ando stand in front of a cinema in Berlin, Germany, you can see three movies posters in the background announcing a Buster Keaton festival. The left one shows his movie 'Cops' - but the German title 'Politzisten' is wrong - it should be 'Polizisten'. (00:09:55)
Chosen answer: Jessica is Niki's dead sister, so Niki somehow embodied the escence of Jessica and against her own will just switches to her sister's personality to take on another persona.
DOB100787